That's interesting. I don't think I've run into a system-specific issue like that since the DDR1 days. Back then, a few DFI boards were notoriously picky.

It was all over the XS forums back during the 965P days, it was extremely spotty but most D9 chip based users couldn't get their Gigabyte boards to boot without first performing those steps I gave. I wasn't to sure of it myself until I got to experience it first hand... sadly I don't think Crucial can claim their kits work in all situations anymore, and it kinda killed any interest of mine in Crucial enthusiast kits. Even booting from a single module just wouldn't work!

It pretty well cemented Corsair as my brand of choice, there just isn't anything these PC2-6400 kits can't do.